Prior to 20th century
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- 45 BCE - Bergomum municipium established.[1]
- 4th C. CE - Roman Catholic Diocese of Bergamo established.[2]
- 894 CE - Bergamo besieged by forces of Arnulf of Carinthia.[1]
- 1108 CE - Comunal consuls elected.[1]
- 1137 - Santa Maria Maggiore church construction begins.[3]
- 1264 - Milanese in power.[4]
- 1336 - Rocca di Bergamo (castle) built.[1]
- 1355 - Santa Maria Maggiore church completed.[4]
- 1408 - Pandolfo III Malatesta in power.[1]
- 1428 - Bergamo becomes part of the Venetian Republic.[4]
- 1476 - Cappella Colleoni (chapel) built.[1]
- 1513 - Artist Lorenzo Lotto moves to Bergamo.[1]
- 1549 - Population: 20,843.[3]
- 1561 - Venetian wall of Bergamo construction begins.[3]
- 1764 - Biblioteca Civica Angelo Mai (library) founded.[5]
- 1776 - Population: 28,581.[3]
- 1780 - Accademia Carrara di Belle Arti di Bergamo (art academy) founded.[1]
- 1791 - Teatro Nuovo (theatre) opens.
- 1797
- French client Republic of Bergamo created.
- Future composer Gaetano Donizetti born in Bergamo.
- 1805 - Lezioni caritatevoli di musica (now the Conservatorio Gaetano Donizetti) founded.[3]
- 1814 - Austrians in power.[3]
- 1840 - Palazzo Frizzoni built.
- 1857 - Bergamo railway station in operation.
- 1859 - Circondario di Bergamo (administrative area) established.
- 1860 - Giovanni Battista Camozzi Vertova becomes mayor.
- 1861 - Population: 37,343.[3]
- 1869 - Banca Popolare di Bergamo (bank) established.
- 1871 - Natural Science Museum founded.
- 1887 - Bergamo Funicular railway Upper Town - Lower Town (funicular) begins operating.[3]
- 1890 - Monza-Trezzo-Bergamo Tram begins operating.
- 1897
- Monument to Donizetti, Bergamo erected in the Piazza Cavour.
- Population: 45,929.[6]
